
80
Real time clock module
R/W
E
A0 to A3
D0 to D3
CS1
CS0 or WR not occurred
CS1
1/5VDD
VDD
4 V
VIL2
VIH2
VIL2
tCDR
tR
2 to 4 V
≤
Data holding mode
Interface possible
with external
terminals
Interface possible
with the external
terminals
Read mode
Write mode
Data holding timing
Switching characteristics
Register table
t EC
t ELW
t ERW
t EHW
t RWE
t DS
t DH
VIL1
VIL
VIH1
VIH
VIH1
VIL1
R/W
E
A0 to A3
D0 to D3
t EC
t ELW
t ERW
t EHW
t RWE
t RD
t ED
VOL1
VIL1
VIH1
VIL1
VIL
VOH1
VOL1
VOH1
VIH1
( VDD = 5 V
± 0.5 V, Ta = 0 to + 70 °C)
Motorola bus system
Switching characteristics on the Intel bus system are the same as those for the RTC-6242 series.
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Symbol
of
register
R-S1
R-S10
R-MI1
R-MI10
R-H1
R-H10
R-D1
R-D10
R-MO1
R-MO10
R-Y1
R-Y10
R-W
CD
CE
CF
D3
r-S8
r-mi8
r-h8
r-d8
r-mo8
r-y8
r-y80
IT/PLS2
IRQ
FLAG0
BANK1
BANK0
D2
r-S4
r-S40
r-mi4
r-mi40
r-h4
___
r-
PM/AM
r-d4
r-mo4
r-y4
r-y40
r-w4
IT/PLS1
RESET
STOP
D1
r-S2
r-S20
r-mi2
r-mi20
r-h2
r-h20
r-d2
r-d20
r-mo2
r-y2
r-y20
r-w2
MASK2
IRQ
FLAG2
30 sec.
ADJ
D0
r-S1
r-S10
r-mi1
r-mi10
r-h1
r-h10
r-d1
r-d10
r-mo1
r-mo10
r-y1
r-y10
r-w1
MASK1
IRQ
FLAG1
READ
FLAG
Real time
register name
1 - sec. digit register
10 - sec. digit register
1 - min. digit register
10 - min. digit register
1 - hour digit register
10 - hour digit register
1 - day digit register
10 - day digit register
1 - month digit register
10 - month digit register
1 - year digit register
10 - year digit register
Week register
Control register D
Control register E
Control register F
Item
__
R/W, address setup time
E “H” pulse width
__
R/W, address hold time
E “L” pulse width
E cycle time
DATA setup time
DATA hold time
E to data (CL=150 pF)
Data hold
Symbol
tRWE
tEHW
tERW
tELW
tEC
tDS
tDH
tRD
tED
Min.
100
220
20
220
500
180
20
––
10
Max.
––
120
––
Unit
ns
Address
BANK 0
Symbol
of
register
A-S1
A-S10
A-MI1
A-MI10
A-H1
A-H10
A-D1
A-D10
A-MO1
A-MO10
A-W
A-EMB
CC
CD
CE
CF
D3
a-S8
a-mi8
a-h8
a-d8
a-mo8
ae8
HD/SFT
D2
a-S4
a-S40
a-mi4
a-mi40
a-h4
___
a-
PM/AM
a-d4
a-mo4
r-w4
ae4
CY2
24/12
D1
a-S2
a-S20
a-mi2
a-mi20
a-h2
a-h20
a-d2
a-d20
a-mo2
a-w2
ae2
TEST2
CY1
CAL
D0
a-S1
a-S10
a-mi1
a-mi10
a-h1
a-h10
a-d1
a-d10
a-mo1
a-mo10
a-w1
ae1
TEST1
CY0
D
P
Alarm
register name
1 - sec. digit register
10 - sec. digit register
1 - min. digit register
10 - min. digit register
1 - hour digit register
10 - hour digit register
1 - day digit register
10 - day digit register
1 - month digit register
10 - month digit register
Week register
Area define register
Test register
Control register D
Control register E
Control register F
BANK 1
Same as BANK 0